The body of literature, with its limits and edges, exists outside some people and inside others. Only after the writer lets literature shape her can she perhaps shape literature. In working-class France, when an apprentice got hurt, or when he got tired, the experienced workers said, “It is the trade entering his body.” The art must enter the body too. A painter cannot use paint like glue or screws to fasten down the world. The tubes of paint are like fingers; they work only if, inside the painter, the neural pathways are wide and clear to the brain. Cell by cell, molecule by molecule, atom by atom, part of the brain changes physical shape to accommodate and fit paint.  You adapt yourself, Paul Klee said, to the contents of the paintbox. Adapting yourself to the contents of the paintbox, he said, is more important than nature and its study.

(Annie Dillard, The Writing Life)